package Test3;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UDPReceive implements Runnable {
    DatagramSocket socket = null;

    private int port;
    private String msgFrom;

    public UDPReceive(int port, String msgFrom) {
        this.port = port;
        this.msgFrom = msgFrom;
        try {
            socket = new DatagramSocket(port);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            try {
                //准备接收包裹
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container, 0, container.length);
                socket.receive(packet); //阻塞式接收包裹

                //输出数据
                byte[] data = packet.getData();
                String msg = new String(data, 0, packet.getLength());
                System.out.println(msgFrom + ":" + msg);

                //断开连接条件
                if (msg.equals("bye")) break;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //关闭连接
        socket.close();
    }
}
